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Income Taxes - Deferred tax assets (liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Deferred tax assets: |  |
Pension | $ 1,006 | $ 1,410
Intangibles | 61 | 94
Other reserves and accruals | 628 | 1,131
Inventory reserves and other | 232 | 684
Federal and state tax credits | 1,141 | 391
Federal and state net operating loss carryforwards | 123 | 3
Foreign net operating loss carryforwards | 2,333 | 1,766
Depreciation and amortization | (190) | (244)
Gross deferred tax assets | 5,334 | 5,235
Less: valuation allowance | (5,334) | (4,086)
Realizable deferred tax asset | $ 0 | $ 1,149

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